Feasibility Assessment of the Use of Recycled Aggregates for Asphalt Mixtures

Martinho, Fernando J. B.; Picado-Santos, Luís; Capitão, Silvino

doi:10.3390/su10061737

Cited by 40 publications

(35 citation statements)

References 68 publications

(161 reference statements)

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“…The framework provided by Martinho et al [137] was considered to perform a simple cost analysis regarding the construction of a 5 cm thick asphalt concrete (AC14 surf 35/50) wearing course. Using conventional materials (unmodified asphalt binder) the estimated cost was 6.8 €/m 2 .…”

Section: Cost Evaluationmentioning

confidence: 99%

A Review of Nanomaterials’ Effect on Mechanical Performance and Aging of Asphalt Mixtures

et al. 2019

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This review addresses the effects of the modifications with nanomaterials, particularly nanosilica, nanoclays, and nanoiron, on the mechanical performance and aging resistance of asphalt mixtures. The desire for high-performance and long-lasting asphalt pavements significantly pushed the modification of the conventional paving asphalt binders. To cope with such demand, the use of nanomaterials for the asphalt binder modification seems promising, as with a small amount of modification an important enhancement of the asphalt mixture mechanical performance can be attained. Several studies already evaluated the effects of the modifications with nanomaterials, mostly focusing on the asphalt binder properties and rheology, and the positive findings encouraged the study of modified asphalt mixtures. This review focuses on the effects attained in the mechanical properties of the asphalt mixtures, under fresh and aged conditions. Generally, the effects of each nanomaterial were evaluated with the current state-of-art tests for the characterization of mechanical performance of asphalt mixtures, such as, permanent deformation, stiffness modulus, fatigue resistance, indirect tensile strength, and Marshall stability. Aging indicators, as the aging sensitivity, were used to evaluate the effects in the asphalt mixture’s aging resistance. Finally, to present a better insight into the economic feasibility of the analyzed nanomaterials, a simple cost analysis is performed.

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Section: Cost Evaluationmentioning

confidence: 99%

A Review of Nanomaterials’ Effect on Mechanical Performance and Aging of Asphalt Mixtures

et al. 2019

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“…Along these lines, various studies reconsider the management of materials and products or services, experimenting with how to extend their useful life, reuse them, re-manufacture or recycle them along the value chain from cradle to cradle [14][15][16][17]. It would imply a reduction in the production and consumption of raw materials [18]. Consequently, circular supply chain (CSC) promotes transformation from a linear to a circular model of flow of products [19].…”

Section: Introductionmentioning

confidence: 99%

Main Dimensions in the Building of the Circular Supply Chain: A Literature Review

et al. 2020

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Circular economy is an alternative to the traditional production model and has therefore attracted a great deal of attention from researchers. The change in the production system is accompanied by new logistical needs related both to resources and waste and to the distribution and recovery of products. The circular supply chain involves return processes and the manufacturer intends to capture additional value in the supply chain. In this paper, value chains have been mapped to visualize the links and interactions between the different stages and actors to understand the complexities of these systems and to make informed decisions. For this reason, and based on thorough literature review, the final objective of this work is to achieve a conceptual framework to study circular supply chain, which uses the main theoretical perspectives in strategic management literature. Four dimensions have been identified to support the development of these new supply chains—greater intensity in the relationships established in the supply chain, adaptation of logistics and organizational, disruptive and smart technologies, and a functioning environment. It can be concluded that to develop a new relationship capacity will allow for reaching more frequent, closer relationships with more actors. These relationships will be developed within an adapted organizational and logistical framework that is framed in new business model archetypes. However, dimensions related to the business environment such as sectoral, legislative, and fiscal frameworks must be incorporated.

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“…Other uses of the RCA include: roads substructures, earth dam construction [35][36][37], paving blocks and structural blocks and bricks manufacture [37,38], bituminous-aggregate mixes [39][40][41][42], road pavements [43], self-compacting concrete [44][45][46], polymer concrete [47], shotcrete [48,49], concrete exposed to elevated temperatures [50], soil stabilization [51], pervious concrete [52], reactive powder concrete [53], artificial reef formation [37].…”

Section: Introductionmentioning

confidence: 99%

Properties of Concrete with Recycled Concrete Aggregate Containing Metallurgical Sludge Waste

et al. 2020

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Sand has been considered to be something of an immeasurable quantity. There are many indications that this view is no longer valid and that the limiting of natural aggregates usage is doubly justified. Firstly, the extraction of natural aggregates is expensive and has a huge impact on the environment. The main issues in sand and gravel mining are the large areas that are affected, ground water level changes, illegal mining, unsuitability of desert and marine sand, and costs of transport. Secondly, metallurgical waste can be used as a substitute for natural aggregates. This is doubly beneficial—the waste is recycled and the use of natural aggregates is reduced. Waste is stored in landfills that take up large areas and there is also the possibility of ground and groundwater pollution by hazardous compounds. The research presented in this article focuses on the technological conditions of using metallurgical waste in its original form and as a component of recycled concrete aggregate (RCA). The use of metallurgical sludge waste or crushed or round RCA to produce concrete deteriorates the consistency and does not significantly affect the air content and density of the concrete mix. RCA lowers the density of hardened concrete. Metallurgical sludge waste or RCA usage adversely affect the absorbability and permeability of concrete. Concrete containing metallurgical sludge waste is of higher compressive strength after 7 and 28 days, with up to 60% of waste as a sand replacement. RCA concrete achieved higher compressive strength also.

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Feasibility Assessment of the Use of Recycled Aggregates for Asphalt Mixtures

Cited by 40 publications

References 68 publications

A Review of Nanomaterials’ Effect on Mechanical Performance and Aging of Asphalt Mixtures

A Review of Nanomaterials’ Effect on Mechanical Performance and Aging of Asphalt Mixtures

Main Dimensions in the Building of the Circular Supply Chain: A Literature Review

Properties of Concrete with Recycled Concrete Aggregate Containing Metallurgical Sludge Waste

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